Screw starter



March 14, 1939. GjF. PEARSQNV 2,150,184

, SCREW STARTER Filei April 7, 193e [lll/111111111.' ull/11115111. 1

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' Patented PATNT oir-"sfiora:

2,150,184 scnsw s'rsn'rsa George F. reunen, sm Leie city, man Appunti@April 1, 193s, serial No. 73,122

2 calma l(ci. 14s-5o) i My invention relates to screw starters orholders and has for its object to provlde a new and emcient screwstarter or holder lwhich will hold a screw tlrmly while it is being:started and which may be used to drive the screw until sumcientpressure has been applied to release the starter.

' A further object is to provide a screw holder which will be easy touse, quick invits operation. and economical to'build.

A still further object is to provide a' screw starter or holder which iseasily attached to the slot of the screw head and which rmly grips theslot but, when suflicient pressure has been applied to the screw,instantly releases itself and is free A still further object is toprovide ascrew Astarter which. has no projections to make the starterlarger than the one size and which may be used to start small or largescrews without variation.

A still further object is to provde a screw holder which may be set andthen inserted into lany remote, position to engage within the slot ofthe screw.

A still further object is to provide a screw holder in which the screwengaging blade is made of spring metal and has suicient give or torqueFigure 2 is an enlarged diametrical section of jthe head of the device.

Figure 3 is an end view of Figure 2. Figure 4 is a like section with thedevice set for 46 engaging a screw slot.

Figure 5 is an end view of Figure 4.

Figure 6 is a plan view of the torque blade oi the device which engagesthe slot of the screw to hold the screw onto the blades of the head.

l0 Figure 'I is an edge view of Figure 6.

f Figure 8 is a side elevation of the head removed from the handleshaft.

Figure 9 is a vertical section of a slightly modiviied form of thedevice which has no resiliency in VIl its slot engaging blade.

Figure 1o is e view er the hendle with the need 4removed to show thehandle and screw blade shown in Figure 9. I Figure 11 is a sideelevation of the plug which is inserted into the end of the handleshaft. 5 In the drawing I have shown the handle shaft as A, the knurledhandle as B, and the end of the handle shaft AV is bored out with alarger diametered bore 5 in the end thereof and a smaller diameteredbore 6 continued into the shaft. Into l0 this double diametered bore ofthe shaft I .then secure my torque screw slot engaging blade 1. 'I'hisblade l is made with a larger at end 8 and narrower blade 9. The extremeend oi' the blade 9 is provided with notches I0 on opposite sides l5thereof extending inwardly from the edge to near the middle of the endof the'blade.

y The notches are made with the edge ofthe notch nearest the end of theblade vertical and the other side of the notches slanting on an angle 20thereto to properly engage the slot of the screw and provideV betterengaging qualities and allow for movement ofthe starter in the slot ofthe screw head without entirely withdrawing it from the slot` orallowing it to fall therefrom. The 25 blade is inserted into the smallerbore of; the handle by iirst placing a driving end plug Il 'therearoundand then inserting the plug and blade into the handle simultaneously bypressure. The plug H is provided with the inner end formed smaller andwith serrated or splined surface to allow it to be pressed into the bore5 and held in fixed-relation thereto permanently. The iiat head end 8 ofthe blade 1 is wider than the diameter of the bore 6 and lior allpractical purposes is 35 substantially the same width as the end of theplug H. Thus, when the plug and blade are inserted into the shaft A, thepressure makes or forces the at end 8 of the blade 'l into the sides ofthe'metal of the bore 6, making its own mill cuts or grooves and theserrated end of the plug Il being also forced into the bore 5 the plugand blade are held in fixed relation to the shaft A. I'he bore lla ofthe plug Il is slightlyi larger in l diameter than the width ofthe blade1.' Thus. 4.5

the torque-blade 1 may' turn or twist' within the plug. Surrounding theouter end of the blade 'I I then provide a spring I5 which spring hasone end drawn down to smaller diameter to tit the two sides of the bladel and lock the inner. end of the springto the blade 1.

- 'I'he head C of the device is made with a longi tudinal bore l1thereinto to near the screw blade end I8 and a smaller bore I9 istherethrough lthrough which the torque blade 'I is 60 a hole 34 in thehead F thus, locking the head to passed and operated. The head c isplaces on che end of the shaft A surrounding the torque blade 'l and thespring l5 and a hole is'bored through one side of the head through whichthe outturned end 2b of the spring is passed and secured. This securesthe head to the. spring and the spring to the blade so that the head maybe moved slightly in and out on the torque blade against spring pressureand. also partially rotated around the vtorque blade or the reversemaybe that the torque blade may be rotated slightly within the v head.The head has a limiting and locmng groove or slot 22 cut through oneside thereof and a limiting-and locking plug or pin Ellis inserted`through said slot into a hole 2d in said plug il.

One -edge of the slot which is toward the shaft A.

is formed with a curved notch 255 on one endthereof to allow the deviceto be locked in set position ready to receive a screw. When the head isturned and slightly withdrawn from the shaft A and the plug locked. intothe notch 25, the torque blade l is withdrawn slightly.

'As a screw engaging and turning blade, the head C is provided with tworadially aligned spaced apart blades 2d and El on the. outer end thereofso formed that when the torque blade is slightly withdrawn and in theset position, the blades 2d and 2l and the blade l are in alignment,with the blade l hlling the space therebetween, but not being extendedthe full length of the other blades, but'being slightly withdrawn as setout above. The two blades 2t and dl are inserted into yures 9' and 10the shaft is shown as E with a socket in the end thereof in which around screw engaging blade 29 is secured. This blade has the end formedinto a screw driver blade by cutting 0H the two sides to leave thecentral diametrical4 blade 30. Surrounding this blade I provide a spring3l with the end of the spring set into a slanting hole 32 in the. end ofthe screw driver handle. This hole is set on a slant so 'that thetension of the spring will not tend to withdraw the end from the hole.Surrounding the screw and blade I provide a head F similar to the head Cwith a central-hole therein to t the step cut or bearing portion 33 ofthe handle shaft E and withthe bore in the end of the head to allow theend of the blade 30 to project therethrough. The end of the spring 3l isturned out and engaged in the spring and the spring to the shaft. A slot35 is cut through the head with a notch in one end on the side towardthe shaft and a limiting pin 36 is passed through said slot into theholes 31 in the .end of the shaft and the hole 38 in the blade 28, thus,locking the blade into the shaft and limiting the turn and end movementofthe head.

Across and on the end of the head E, I provide the screw engaging blades39 and 40 spaced apartl a screw slot. 2. In a screw starter of the classdescribed the arcaica by the bore in the head inwhich--thelblade 30 iscarried. The operation of this device is identical to that of thepreferredforms other than the allowance of torque in the preferred formis per- Arnittfed to eliminate any possible chance of breaking the screwslot engaging blade.

The operation of my screw starter is as follows:

When it is desired to start a screw the starter is first set by theoperator. This is done by partially rotating the head C and drawing itoutwardly which engages the plug -or pin 23 in the notch 25 thus lockingthe head in its tension position. The two blades 26 and21 are theninserted 1 into the cross slot in the head ofthe screw S and a slightpressure is exerted on the shaft or handle, forcing the head toward thescrew. This releases the pin from thenotch and the blade 1 is thrustforwardly into the slot at the same time -it is turned and thetooth-like notches Il! engage the sides ofthe screw slot or groove.Illhe screw is then on the endl of the starter ready for insertion. Wheninserted, it is driven by the starter until sumcint pressure is exertedon the screw by the socket into which it is being driven to cause thehead C to rotate against the spring pressure and the torque of the bladeand the blade is released andthe pin 23 again engaged in the notch 25ready for another use.

Having thus described my invention I desire to A one end on'the handleside; a pin in said slot with the end in said shaft to allow the head tobe partially rotated, slightly d rawn out, and locked into set positionin said notch ready to engage. the slot engaging blades into the slot ofa screw head; and a spring in said head secured thereto at one end andto the shaft at the other end, with the tension of the spring acting torotate the head against the torsional urge of the spring bladel whenboth the blades and blade are engaged in combination of-a handle and.shaft made of one piece; a plug carrying a flat spring blade, twistableunder torsion driven into an vopen bore in `,the end of said shaft tosecure the blade in said handle with; the end of the blade extendingbeyond said plug; a sleeve head carried surrounding said plug and theextended end of the blade with the blade normally extended beyond thesleeve head, with the end of the sleeve head formed into spaced apartscrew slot engaging blades; 'means in said head and on said shaft tolock the head in extended position; and a helical spring surroundingsaid' blade within said head with `one end attached to said head'and theother end secured in the end of said plug, said spring exerting atorsional urge to said head; cooperating with but acting in the oppositedirection to the tor'- sional urging action of the at spring blade tohold the screw on the blades.

GEORGE F. PEARSON.

